Vapour pressures of(propylether + methanol) at eight temperatures between T = 278.15 K and T = 323.15 K were measured by a static method. Excess enthalpies and volumes were also measured at T = 298.15 K. Reduction of the vapour pressures to obtain activity coefficients and excess molar Gibbs free energies was carried out by Barker’s method. Azeotropic mixtures with a minimum boiling temperature were observed and the azeotropic coordinates were calculated.